Question

A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms–1. How long does the body take to stop?

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Answer 1

Answer:

6 seconds

Explanation:

A. Given that,

Force F=50N

Mass m=20kg

Initial velocity u=15m/s

Now, from newton’s second law

  F=ma

 50=20×a

 a=2.5m/s2

Now from equation of motion

  v=u+at

 0=15+(−2.5)t

 t=2.515

 t=6s

Hence, the body will be stop in 6 sec

Answer 2

Answer:

Nothing, how are you????